Rubella is contagious because it is an infectious disease. Rubella is contagious by means of respiratory droplets. When rubella virus infects a person, it can cause respiratory symptoms such as coughing, in addition to the typical rash that appears all over the body. Although these symptoms are not serious, the rubella virus can be contained in respiratory secretions and can be transmitted to other people through respiratory droplets. Therefore, if you have rubella, you should be isolated, mainly to prevent transmission to other people. However, if a person with normal immunity and is not pregnant, rubella is not harmful to the body, even if the clinical symptoms appear. It will last about 3-4 days and the corresponding symptoms will largely disappear.